Transcript Solotvina Underground Laboratory

Solotvina Underground Laboratory
Institute for Nuclear Research
(Kiev, Ukraine)
http://lpd.kinr.kiev.ua
Solotvina Underground Laboratory was built up in 1984 on the
west of Ukraine in Solotvina
(Transcarpathian region)
NaCl salt mine 430 m underground (1000 m w.e.)
Total square  1000 m2
Background conditions
 flux: 1.5103 m-2·d-1
measured by plastic scintillator counter
Termal n flux: 310-6 cm-2·s-1 by 3He counter
Radon:
30 Bq·m-3 by radon monitor
(Honeywell A 9000A 1006)
Temperature is 241C independent of season
Background of CdWO4 scintillator (44 cm)
Kiev
Solotvina
1000 m w.e.
Solotvina
in shield
Background measured by HP Ge detector 165 cm3
Solotvina, 1000 m w.e.
1109 h, in shield
Set up with HP Ge
Due to low radioactive contamination of the salt, the natural  background
in the SUL is 10100 times lower than in other underground laboratories
Experiment to search for 2 decay of 116Cd
Kiev-Florence collaboration
Plastic
active
shield
Copper
CdWO4
20.6 kg
116CdWO
0.33 kg
4
Plastic
light
guide
Quartz
light
guide
Channel for
calibration
Main results of 116Cd  experiment
22 decay of 116Cd was observed
Limits on 02 decay of 116Cd
T1/20  1.723 yr
at 90 % C.L.
m  1.7 eV
  2.510-8
  2.210-6
T1/20M  0.822 yr
gM  8.110-5
CAMEO project
was proposed
PRC 68 (2003) 035501
100 kg of 116CdWO4
scintillators allocated in a large
volume of high-pure liquid

PLB 493 (2000) 216; EPJC 19 (2001) 43
Search for 2 decay of 160Gd
was performed with the help of Gd2SiO5(Ce) crystal
scintillator, 635 g, 13 949 h
2 160Gd
Q2 = 1730 keV

T1/20  1.321 yr
T1/22  1.919 yr
at 90 % C.L.
Yad. Fiz. 58 (1995) 195; NPA 694 (2001) 375
 decay of 113Cd was investigated
CdWO4 454 g, 433 h
½+
113Cd
0

9/2+ 0
Q = 316 keV
113In
Fourth-forbidden  decay
T1/2= (7.70.3)1015 yr
[ Yad. Fis. 59(1995)5 ]
Previous T1/2: (9.31.9)1015 yr [1]; (9.30.5 1)1015 yr [2]
[1] J.Inorg.Nucl.Chem. 32(1970)2113; [2] NPB (Proc.Suppl.) 35(1994)394
 decay of 180W was observed
116CdWO
+0.8
–0.4
T1/2= [1.1
4
330 g, 2975 h,  spectrum
(stat)0.3(syst)] 1018 yr
Recently this result was confirmed with CaWO4 as scintillator [Yu.G.Zdesenko et
al., NIMA in press] and bolometer [C.Cozzini et al., PRC 70(2004)064606]
PRC 67 (2003) 014310
Low radioactivity technique
 Sensitive methods to measure radioactive contamination of
scintillators were developed
Radioactive contamination of (Ca, Zn, Cd & 116Cd)WO4,
GSO scintillators was measured
CaWO4 and ZnWO4 were studied as detectors to
search for 2 decay processes in 48Ca and 64Zn, and as
dark matter detectors
APP (2005); NIMA (2005) in press; nucl-ex/0409014, accepted to NIMA
 Study of PbWO4, BGO, GSO, YAG:Nd, CaMoO4 crystal
scintillators to search for rare processes is in progress
nucl-ex/0412021; nucl-ex/0410021, accepted to NIM A
Current status of research in Solotvina
Advancement of the
116Cd
 experiment:
3-51024 yr  m  0.3 eV
Low counting experiments in collaboration with
Roma 1 & 2 Universities and LNGS
Modernization of the Solotvina Underground Laboratory
will be realized in 2005 thanks to
financing from the Ukrainian National Academy of Sciences
The Solotvina Underground
Laboratory would like to
participate in the ILIAS
PROGRAMM